Patent GB-607744-A (GB)
Abstract: 607,744. Calculating apparatus. NATIONAL CASH REGISTER CO. Feb. 11, 1946, No. 4212. Convention date, Feb. 22, 1945. [Class 106 (i)] An accounting machine includes manipulative devices to control different machine operations, a plurality of electrical means controlled by a travelling carriage automatically to operate related manipulative devices, and common control means between the carriage and the electrical means arranged to operate one or more of said electrical means according to the columnar position of the carriage. Machine release. Depression of a main release bar 33, Fig. 1, a skip tabulating release bar 34 or a vertical feed release bar, through a stud 38, rocks a bar 40 and a latch 42 clockwise to cause a hook 46 to rock a lever 48 counterclockwise. A stud 50 on the lever 48 rocks an arm 51 bearing fingers 53, 54 which engage the bent-over end 55 of a slide 56 to rock the slide and an arm 57 clockwise. This disengages a stud 66 from a shoulder 67 to free an arm 68, a pitman 70 and a lever 73, which rocks under spring action to engage clutch mechanism and simultaneously close a switch to energize a driving motor to initiate machine operation. Near the end of the machine operation, the lever 73 is restored in known manner and the shoulder 67 releases the stud 66 to allow all parts to return under the action of a spring 65. If the bar 33, 34 or 35 is held down, a repeat operation is prevented by the overthrow of the arm 68 causing a shoulder 74 to engage a stud 58 to push the slide 56 inwards to disengage the bent-over end 55 from the fingers 53, 54 so that the arm 57 is restored by the spring 65 independently of the release bar. When the bar is released, a spring 49 restores the lever 48 and the arm 51 to permit the bent-over end 55 to return to its normal position between the fingers 53, 54. Keyboard and differential mechanism. A plurality of denominational rows of amount keys position corresponding differential actuators 76, Fig. 9, and type sectors 80 to print on paper carried by a movable carriage 82. The actuators carry rack teeth 87 for actuating the corresponding wheels 88 of a balance totalizer additively or subtractively according to the entry. In balance and sub-balance operations, the balance wheels are zeroised to position the actuators and printing mechanism according to the amount on the balance totalizer. Travelling carriage. The carriage is urged to the left, i.e. in tabulating direction by a spring-actuated drum and draw-band and is controlled by known escapement mechanism. The carriage is returned from extreme left by a rack clutched to and declutched from the motor automatically, the motor being controlled by a mercury switch. The carriage may be tabulated manually or automatically, depression of an arm 140, Fig. 4, rocking a lever 138 which rocks a pair of levers 127, 137 to permit a stud 126 to release a tabulating stop-bar 123 and an escapement control bar 124, which rise under spring action. The lever 127 is held in clockwise position by a latch 143 which cams the stop-bar 123 slightly to the left. The escapement control bar 124 is held in uppermost position by being latched over a spring- pressed stud 148. Clockwise movement of the lever 127 shifts a bar 130 downwards to withdraw an escapement retaining pawl (Figs. 6 and 8, not shown) to permit tabulation, the carriage moving until a stop. lug 122 of a control block 121, located on the carriage in the next columnar position, strikes the upper end of the bar 123, which shifts to the right to rock the latch 143, which releases the lever 127. The lug 122 then contacts the bar 124, which rocks to the right to become free of the stud 148 and then descends to rock the second lever 137 which frees the bar 130, to cause re-engagement of the escapement-retaining pawl. Carriage control of machine release. When the carriage is in a columnar position, the appropriate control block 121, Fig. 1, depresses a control lever 166 to rock a lever 173 clockwise to free the lever 48 for actuation, but when the carriage is out of columnar position, the lever 173 is spring-pressed into counter-clockwise position to block a stud 176 on the lever 48 to lock the machine. Carriage control of totalizer functions. Known mechanism is provided for selecting and controlling the totalizers for addition, subtraction and for printing without entry into a totalizer under control of the blocks 121. Skip-tabulating. Depression of the skiptabulating bar 34 rocks a latch 280, Fig. 4, over the lever 137 to restrain this lever against clockwise movement so that the bars 123, 124 stay in lowermost positions and the carriage tabulates through the intervening columnar positions until, in the manner described in Specification 461,347, the latch 280 is released. Balance and sub-balance keys. The balance totalizer is selected and conditioned for balance or sub-balance operations by depression of a balance key 180 or sub-balance key 181, Fig. 9, respectively. The balance key is motorised and the sub-balance key 181, through a finger 185, carries the balance key with it. Depression of the balance key causes an ear 196, Fig. 12, on an arm 197 pivoted thereto to rock a non-repeat pawl 192 counterclockwise to release a trip lever 189, which rocks to engage a notch 187 in the key stem and also to rock the arm 197 counterclockwise to move the ear 196 out of engagement with the pawl 192. The trip lever 189 also rocks an arm 202 and a shaft 203, also Fig. 1, to rock the plate 48 to initiate a machine operation, at the end of which the plate 48 is restored to restore the trip lever 189 and all related parts. Interlock between machine release and balance key. During machine release, depression of the balance key 180 is prevented by the lever 48 rocking the shaft 203 to cause a finger 212 on an arm 213 engaging under a portion 211 of an arm 208 which blocks a stud 207 on the key stem against depression. Alternatively, when the key 180 or 181 is partially depressed, the stud 207 rocks the arm 208 to obstruct movement of the finger 212 and so to prevent releasing movement of the shaft 203. Automatic balance and sub-balance mechanism. The balance and sub-balance control blocks 215, 214, Fig. 4, are mounted in predetermined columnar positions and carry pivoted control tappets 217, 216 which pass freely over an extension 218, if it should be raised inadvertently, when the carriage is being returned, but which engage the extension 218 in a tabulating movement to initiate a balance or sub-balance operation. As already described, the carriage is tabulated when the arm 140, Fig. 4, is depressed to rock the lever 127 clockwise. This causes a link 263 to pull a stud 262 to the left to shift arms 219, 222 in opposite directions, raising the extension 218 into the path of the tappets 217, 216. When the carriage nears a sub-balance position, just before being halted by the stop lug 122, the sub-balance tappet 216 depresses the arm 219, stud 262 and the arm 222 to shift a bar 223 full distance downwards to close contacts 225, 226, 227 to energize the balance and subbalance solenoids 231, 235, Fig. 9, to depress the keys 180, 181, to initiate an automatic sub-balance operation. The stop lug 122 then comes into action to halt the carriage and return the stud 262 to release the contacts and the solenoids. In a similar manner, in automatic balance operations, the tappet 217 closes only the contacts 225, 226 to energize the solenoid 231 and depress the key 180. When an overdraft occurs in the balance totalizer, the usual overdraft shaft 270, Fig. 9, rocks to cause a latch 275 to lock the balance key 180 against depression. It, also actuates known mechanism to release an overdraft key or sub-overdraft key to permit printing of the true negative balance. Control of machine releasing mechanism. Continued depression of a release bar is prevented from jamming the machine. Near the end of a machine operation, the release arm 68 overthrows in a clockwise direction to rock a lever 284 which shifts the latch 42 to disengage the hook 46 from the stud 47 if any of the release bars is held depressed. This frees the lever 48 for return movement under spring action. The lever 48 restores the shaft 203 and arm 213, Fig. 12, to free the balance key if the next operation should be an automatic balance or sub-balance operation. Release of the bar 33 or 34 permits the foot-shaped extension of the latch 42 to byepass the stud 47 to restore parts to original positions. Specification 614,345 also is referred to.